<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div {
            width: 200px;
            background-color: rgba(0,0,0,0.5);
        }
        div a {
            display: inline-block;
            width: 200px;
            height: 58px;
            text-align: center;
            line-height: 58px;
            text-decoration: none;
            color: #fff;
        }
    </style>
</head>
<body>
<div>
    <a href="" class="bg1">五彩导航</a>
    <a href="" class="bg2">五彩导航</a>
    <a href="" class="bg3">五彩导航</a>
    <a href="">五彩导航</a>
    <a href="">五彩导航</a>
</div>
</body>
</html>